Fig. 7
From: Volatiles of symbiotic bacterial origin explain ectoparasitism and fledging success of hoopoes
Statistically significant partial associations between intensity of parasitism (number of Carnus flies traces) in eight (a) and 19 (b and d) days old nestlings, and females (number of chewing lice) (c) (dependent variables) and Principal-Components (PC) scores summarizing relative abundances of detected bacteria (green dots, a, c and d) or volatiles (blue dots, b) estimated from samples collected during the early (a and c) and late (b and d) nestling periods. Each PC-axis was named by a composition of letters that indicate the type of samples. The first letter indicates whether the sample corresponds to bacteria (B) or volatiles (V), the second letter indicates whether the sample is from secretions of females (SF), secretion of nestlings (SN) or nest material (M). Finally, for distinguishing types of samples that were collected at the beginning (1) and at the end (2) of the nestling period, the name finished with a number. Lines are regression lines